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SETRESUID(2) | System Calls Manual | SETRESUID(2) |
NAME¶
getresgid
,
getresuid
,
setresgid
,
setresuid
—
get or set real, effective and saved user or group
ID
LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include
<sys/types.h>
#include
<unistd.h>
int
getresgid
(gid_t
*rgid, gid_t
*egid, gid_t
*sgid);
int
getresuid
(uid_t
*ruid, uid_t
*euid, uid_t
*suid);
int
setresgid
(gid_t
rgid, gid_t
egid, gid_t
sgid);
int
setresuid
(uid_t
ruid, uid_t
euid, uid_t
suid);
DESCRIPTION¶
Thesetresuid
() system call sets the real,
effective and saved user IDs of the current process. The analogous
setresgid
() sets the real, effective and
saved group IDs.
Privileged processes may set these IDs to arbitrary values. Unprivileged
processes are restricted in that each of the new IDs must match one of the
current IDs.
Passing -1 as an argument causes the corresponding value to remain unchanged.
The getresgid
() and
getresuid
() calls retrieve the real,
effective, and saved group and user IDs of the current process, respectively.
RETURN VALUES¶
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.ERRORS¶
- [
EPERM
] - The calling process was not privileged and tried to change one or more IDs to a value which was not the current real ID, the current effective ID nor the current saved ID.
- [
EFAULT
] - An address passed to
getresgid
() orgetresuid
() was invalid.
SEE ALSO¶
getegid(2), geteuid(2), getgid(2), getuid(2), issetugid(2), setgid(2), setregid(2), setreuid(2), setuid(2)STANDARDS¶
These system calls are not available on many platforms. They exist in FreeBSD to support Linux binaries linked against GNU libc2.HISTORY¶
These functions first appeared in HP-UX.April 13, 2001 | Debian |